The number three in Italian, or a musical term referring to a group of three notes. Also used as a prefix meaning three in various contexts.
From Latin tres meaning 'three,' which also gave rise to French trois and Spanish tres. The musical usage comes from Italian musical terminology, where 'tre' appears in phrases like 'a tre voci' (for three voices).
In music theory, 'tre' appears in the delightfully specific term 'tre corde,' which tells pianists to release the soft pedal and let all three strings per note vibrate - the opposite of 'una corda' where only one string sounds.
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